Improvement in calipers



UNITED STATES PATENT OFFICE.

SETH WHALEN, OF BURNT HILLS, NEW YORK.

IMPROVEMENT IN CALIPERS.

To all whom it may concern:

Be it known that I, SETE 'WHALEN, ot' Burnt Hills, in the county ofSaratoga and State of New York, have. invented and made a certain newand uset'nl Improvement in Calipers and Dividers; and I do herebydeclare the follow ing to be a full. clear, and exact description ot thesaid invention, reference being had to the annexed drawings, making partof this specilication, wherein- Figure l is an elevation of my saidinstrument; and Fig. 2 is a view, endivise, ofthe same; and Fig. 3represents a. slight modifica tion in my improved instrument.

Similar marks ot' reference denote the same parts.

The nature ot inysaid invention consists in a rule carrying twocross-heads or Ts, one of which is adjusted slightly by a nut. The otheris movable along the rule, and the cross heads on one sideare adapted tothe measurement ot' interior diameters or sizes and the other side tothe measurement ot' external sizes, and I employ points on tlic ends ot'said cross-heads to be used as diyiders, and a point or scribing knifeis inserted in the rule, so as to serve as a barpenters or machinistsgage.

In the drawings, et is the rule, whi. h -I prefer to be formed ot' asteel blade. b is a crosshead or T, fitted accurately to the rule t atright angles to the same. and capable of sliding along on the rule toany desired position,

where it is lit-ld by a clamping-screw, c, ltig.

2, andshown by dot-tod lines in Fig. 1.

`d is the second cross-head or T, itt'ed to one end-of the rule c, andadjusted with accuracy by means of a. nut, e, that is upon a screw thatprojects from the end of a, said nut c being retained by a yoke orstrap,]".

The ends l l ot' the Ts b and d are intended i for measuring externaldimensions, and the divisions on that side of the rule a are madeaccordin gl y.' The ends22of theTs b and d are intended for measuring`internal dimensions. Hence the divisions on that side ofthe rule a aremade so as to allow for the thickness ot' these ends 2 2, as shown bythe numbering of the rule in the drawings, Fig. l. The same character ofT cross-heads is shown in Fig. 3, with the exception that the sides l 1for the measuring of external diametersor dimensions are on line withthe sides 22 for mensili-inginternal dimensions, and the divisions ofthe rule a may be observed through openings in therespectivc Tcrossheads. By adiusting the T cross-head to any desired point thecalipers may be used for measuring either internal or externaldimensions. A groove at one end of the rule a receives a gage knit'e orpoint, i, that may be slid out more or less and used as a gage, themoving cross-head b heilig adjusted to the given distance from the gage.

-A plumbline may be bung on the pin 3, as seen by red lines in Fig. 1,and give bythe rule and cross-head both vertical andliorizontallpositions.

The points 4 4 enable me to use this instrn ment in the capacity otdividers, and these points may be either inserted permanently or beneedle-points held in by scretvs.

What I'claiin, and desire to secure byLetters Patent, is

'lbe rule a., in combination with the adjustablc cross-heads or Ts b andd, forming calipers for external and internal measurements, as specited.

In Witness whereof I have hereunto set my signature this 11th day ofSeptember, A; 1).

SETH WHALEN.

-\\".itnesses:

FRANK W HALEN, H. WHA

